Alternative models of the structure of individual and developmental differences of written composition and handwriting fluency were tested using confirmatory factor analysis of writing samples provided by first- and fourth-grade students. For both groups, a five-factor model provided the best fit to the data. Four of the factors represented…

This paper investigated six to nine year old children's ability to use contractive and possessive apostrophes, the effects of type and token frequency, and the effect of teaching on this ability. Apostrophes provide an interesting opportunity to examine the basis of frequency effects in rule inference, as type and token frequencies dissociate in…